Contacts / iCloud sync problem with Mountain Lion.

Update - once I signed out of iCloud and back in, the error is now;

The operation couldn't be completed. (CoreDAVErrorDomain error 1.)

Thanks for the suggest capierce, however this did not resolve the problem for me.

Just in case it's of assistance, here is a relevant console log;

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26/07/12 11:03:25.375 PM Contacts[796]: [CardDAVPlugin-ERROR] -_handleAddsOrModifies: exception processing addsOrModifies The value for 'host' should be non-nil and non-empty

26/07/12 11:03:25.377 PM Contacts[796]: [CardDAVPlugin-ERROR] Error in _handleAddsOrModifies:removes:inFolderWithURL: The value for 'host' should be non-nil and non-empty

26/07/12 11:03:25.378 PM Contacts[796]: [CardDAVPlugin-ERROR] -_handleAddsOrModifie "MY EMAIL"@p04-contacts.icloud.com/32071570/carddavhome/card/ Error Domain=CoreDAVErrorDomain Code=1 "The operation couldn’t be completed. (CoreDAVErrorDomain error 1.)"

26/07/12 11:03:25.823 PM Contacts[796]: [MIGRATION] ### ------ SUMMARY ------ ###

26/07/12 11:03:25.826 PM Contacts[796]: [MIGRATION] ### Local People: 107 ###

26/07/12 11:03:25.828 PM Contacts[796]: [MIGRATION] ### Local Groups: 0 ###

26/07/12 11:03:25.829 PM Contacts[796]: [MIGRATION] ### Server People: 0 ###

26/07/12 11:03:25.830 PM Contacts[796]: [MIGRATION] ### Server Groups: 0 ###

26/07/12 11:03:25.832 PM Contacts[796]: [MIGRATION] ### Merged People: 0 ###

26/07/12 11:03:25.833 PM Contacts[796]: [MIGRATION] ### Merged Groups: 0 ###

26/07/12 11:03:25.834 PM Contacts[796]: [MIGRATION] ### Removed People: 0 ###

26/07/12 11:03:25.836 PM Contacts[796]: [MIGRATION] ### Removed Groups: 0 ###

26/07/12 11:03:25.837 PM Contacts[796]: [MIGRATION] ### Local People Upload: 107 ###

26/07/12 11:03:25.838 PM Contacts[796]: [MIGRATION] ### Local Groups Upload: 0 ###

26/07/12 11:03:25.839 PM Contacts[796]: [MIGRATION] ### --------------------- ###

26/07/12 11:03:25.841 PM Contacts[796]: [MIGRATION] ### DOWNLOAD ERROR Error Domain=CoreDAVErrorDomain Code=1 "The operation couldn’t be completed. (CoreDAVErrorDomain error 1.)", exiting ###

26/07/12 11:03:25.844 PM Contacts[796]: [MIGRATION] ### EXCEPTION Error Domain=CoreDAVErrorDomain Code=1 "The operation couldn’t be completed. (CoreDAVErrorDomain error 1.)", exiting ###

26/07/12 11:03:25.844 PM Contacts[796]: [CardDAVPlugin-ERROR] Exception caught while running sync with server: Error Domain=CoreDAVErrorDomain Code=1 "The operation couldn’t be completed. (CoreDAVErrorDomain error 1.)"

26/07/12 11:03:28.268 PM WindowServer[108]: CGXSetWindowListAlpha: Invalid window 0

26/07/12 11:03:29.269 PM Dock[273]: CGSReleaseWindowList: called with 3 invalid window(s)

26/07/12 11:03:33.000 PM kernel[0]: considerRebuildOfPrelinkedKernel prebuild rebuild has expired

I'm happy to say I've solved this problem. But it was a pain...

1. I downgraded to Lion 10.7.4 so that contacts would sync again.

2. Run the Remove Duplicates option in Address Book a bunch of times until no duplciates were found.

3. Log in to iCloud website, and back up my contacts to a vcard file.

4. Deleted ALL of my contacts via the iCloud website.

5. Upgrade to Mountain LIon.

6. Create a test contact and confirm sync.

7. Import vcard backup of contacts.

8. YAY! Everything was syncing again, no problems.

I hope this helps someone else.